CONTRIBUTIONS TO SCIENCE. 
BY 
CHARLES J. MAYNARD. 
Volume Three. March, I896. 
MONOGRAPH OF THE GENUS STROPHIA. 
( Continued from Vol. II, page 182, ) 
The first portion of the present instalment of this monograph 
is based upon specimens belonging to the Museum of Comparative 
Zoology, Cambridge, Mass., where I have been permitted to examine 
them through the kindness of Prof. Alexander Agassiz, with a view of" 
determining the species; I have returned the types figured to the 
Museum, but have retained a set of co-types in my own collection. I 
wish also to thank Dr. Walter Faxon for valuable assistance in many 
ways in preparing this paper. 
55. STROPHIA CHRYSALIS Ferussac. 
Chrysalis Strophia. 
Plate I, fig. 1, front view, fig. 2, side view of typical specimen. 
Ferussac, Hist. Nat. Moll. 1820-1851, Vol. II, page 205. Plate 
153, figs. 1 and 2 ( not fig. 7, nor figs. 7 and 8 plate 156 ) . 
DESCRIPTION. 
Sp. Ch. Size, rather large. Shell, moderately thick and heavy. 
Striations, present. Whirls, 11. Examined 11 specimens. 
Form of shell, a long pointed cylinder, with the first, second and 
third whirls equal in diameter, then the shell slopes to a semi-obtuse 
point which forms an angle of forty- three degrees. The striations are 
not numerous, there being fifteen only to the first whirl, not very 
prominent, rather irregular, are slightly bowed in the middle of the 
whirls toward the right, and they are also slightly inclined from right 
